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Message-ID: <9ec858de-c2a5-463c-af1a-b28fde7f5174@acm.org>
Date: Thu, 25 Sep 2025 22:33:46 -0700
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To: cygwin@cygwin.com
Subject: mintty character cell "detritus"
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From: Jim Garrison via Cygwin <cygwin@cygwin.com>
Reply-To: Jim Garrison <jhg@acm.org>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie.com@cygwin.com>

This is a very minor and totally cosmetic issue, but it's been around 
"forever" so I'm curious if I'm the only one seeing it.

When displaying colored text in mintty configured with a block cursor 
and dark background, as the cursor moves across text (in vi, say) it 
will change the color of the rightmost pixel column of certain 
characters (not all).  This happens when moving the cursor 
left-to-right, and the discolored bits disappear (or go back to their 
original color) when moving right-to-left.

I'm pretty sure this has to do with anti-aliasing, and may not even be 
mintty's problem, but I've never seen it anywhere else.

I put a couple of small demonstration screenshots on Google Drive:

Actual size: 
https://drive.google.com/file/d/1gF86FJMJqQJDaFHTVZXEZrMNIyRtTCSL/view?usp=sharing

Enlarged view: 
https://drive.google.com/file/d/15zWPNZQvryILvqRhaiFE3O35L057R8jQ/view?usp=sharing

-- 
Jim Garrison
jhg@acm.org


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